--- product_id: 428185457 title: "Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only" brand: "willow" price: "€ 67.64" currency: EUR in_stock: true category: "Willow" url: https://www.desertcart.hr/products/428185457-breast-pump-sizing-insert-19mm-for-15mm-17mm-nipple-size store_origin: HR region: Croatia --- # Flexible silicone for perfect fit 19mm precision sizing insert Reusable & easy to clean Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only **Brand:** willow **Price:** € 67.64 **Availability:** ✅ In Stock ## Summary > 🍼 Perfect fit, perfect pump—because your comfort deserves the best! ## Quick Answers - **What is this?** Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only by willow - **How much does it cost?** € 67.64 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/428185457-breast-pump-sizing-insert-19mm-for-15mm-17mm-nipple-size) ## Best For - willow enthusiasts ## Why This Product - Trusted willow brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Seamless Compatibility:** Works exclusively with Willow 24mm flanges for a flawless, spill-proof pumping experience. - • **Hassle-Free Maintenance:** Reusable and easy to clean, keeping your pump hygienic and ready to go. - • **Soft, Flexible Silicone:** Gentle material adapts to your shape, ensuring comfort during every pump session. - • **Trusted by Thousands of Moms:** Backed by 724+ reviews with a 4.6-star rating—don’t settle for less than the original. - • **Tailored Fit for Ultimate Comfort:** Precisely designed 19mm insert enhances fit for smaller nipples, boosting pumping efficiency. ## Overview The Willow Breast Pump Sizing Insert (19mm) is a flexible silicone accessory designed to improve fit and comfort for users with smaller nipples when using the Willow Wearable Breast Pump’s 24mm flanges. It is reusable, easy to clean, and compatible exclusively with Willow’s Generations 2 and 3 pumps, ensuring a spill-proof, wearable pumping experience trusted by hundreds of mothers. ## Description Designed for the perfect fit and performance with Willow Wearable Breast Pump. Sizing Inserts make pumping more comfortable for mamas with smaller flange sizes. See size chart in images. ## Features - IMPROVE FIT & COMFORT FOR YOUR WILLOW PUMP: Designed for the perfect fit and performance with Willow Wearable Breast Pump. Sizing is everything when it comes to pumping performance. - FLEXIBLE SILICONE: If your flange size is smaller than 21mm, use these sizing inserts with a 24mm Willow Breast Pump flange to improve fit. Reference the sizing guide on this page for sizing instructions. - EASY ASSEMBLY: Slip them into 24mm flanges or container tunnels for a seamless fit and comfort. - EASY TO USE: Sizing Inserts are reusable, dishwasher safe and easy to clean. Willow recommends replacing sizing inserts regularly for optimal performance. - USE WITH WILLOW PUMP: Exclusively designed to work with the Willow Wearable Breast Pump Generations 2 and 3. The only wearable pump that is totally enclosed and spill-proof in any position. Pump whenever you want and wherever you want. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09B7WMGGQ | | Brand | Willow | | Country of Origin | USA | | Customer Reviews | 4.7 4.7 out of 5 stars (1,398) | | Is the item dishwasher safe? | No | | Manufacturer | Willow | | Manufacturer Part Number | SZ1964 | | Material | Silicone | | Material Type Free | Lead Free | | Model number | SZ1964 | | Operation Mode | Manual | | Product Style | Compact | | Size | 19mm | | Special Features | Wearable | | UPC | 858298006613 | ## Product Details - **Brand:** Willow - **Is Dishwasher Safe:** No - **Manufacturer:** Willow - **Material:** Silicone - **Material Type Free:** Lead Free - **Operation Mode:** Manual - **Size:** 19mm - **Special Feature:** Wearable - **Style:** Compact - **UPC:** 858298006613 ## Images ![Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only - Image 1](https://m.media-amazon.com/images/I/31LUxe1lEfL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Does it come with one or two?** A: Two :) **Q: Are these compatible with the Willow Go?** A: Yes **Q: Can I use these for the zomee z2?** A: I don’t own the zomee but I have tried these with several different pumps and these inserts can pretty much fit universally into any 24mm flange. **Q: I measured for a 17mm flange. According to the sizing chart I would order a 19mm. Is that correct?** A: That is what I did and ir fit very well. I can use them in my willow go and my momcozy s12 pro! ## Frequently Bought Together - Willow Breast Pump Sizing Insert, 19mm, 2 Ct, Flange Inserts for Breast Pump, Improves Fit and Comfort for Breast Pumping Moms, Fits in 24mm Willow Breast Pump Flange - Willow - 360 Breast Pump Flextubes - for Spare Use or Replacement Part for The Willow 360 or 3.0 Wearable, Hands-Free Breast Pump, Breastfeeding Essential for New Moms- 2ct - Willow - 360 Pump Spill-Proof Breast Milk Bags - 48 Ct - Holds 4 oz. Per Self-Sealing Storage Bag - Compatible with Willow 360 or 3.0 Wearable Hands Free Breast Pump --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/428185457-breast-pump-sizing-insert-19mm-for-15mm-17mm-nipple-size](https://www.desertcart.hr/products/428185457-breast-pump-sizing-insert-19mm-for-15mm-17mm-nipple-size) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-10-30*